A B

C

Motion in Desired Direction

A B

C

A B

C

A B

C

A B

C

A B

C

A B

C

Since the action potential from A was released slightly before that from B, they both reached C at the same time, causing C to respond.

A B

C

Motion in Undesired Direction

A B

C

A B

C

A B

C

A B

C

A B

C

A B

C

A B

C Since there was never enough excitatory transmitter substance present near its dendrites, neuron C never responded.

Apparent Motion

A B

C

A B

C

A B

C

A B

C

Even though there was no motion, since A and B were stimulated in the correct sequence and at the appropriate time interval, C responded in the same way as it responded when actual motion in the desired direction was present